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drm/amdgpu: use polling mem to set SDMA3 wptr for VF

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On Tonga VF, there're 2 sources updating wptr registers for
sdma3: 1) polling mem and 2) doorbell. When doorbell and polling
mem are both enabled on sdma3, there will be collision hit in
occasion between those two sources when ucode and h/w are doing
the updating on wptr register in parallel. Issue doesn't happen
on CP GFX/Compute since CP drops all doorbell writes when VF is
inactive. So enable polling mem and don't use doorbell for SDMA3.

Signed-off-by: Pixel Ding <Pixel.Ding@amd.com>
Reviewed-by: Monk Liu <monk.liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Pixel Ding 2017-12-11 16:48:33 +08:00 committed by Alex Deucher
parent b852f3d3fb
commit 2ffe31deb2
2 changed files with 20 additions and 8 deletions
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1
drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
View File

@ -186,6 +186,7 @@ struct amdgpu_ring {
uint64_t eop_gpu_addr;
u32 doorbell_index;
bool use_doorbell;
bool use_pollmem;
unsigned wptr_offs;
unsigned fence_offs;
uint64_t current_ctx;

27
drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c
View File

@ -355,7 +355,7 @@ static uint64_t sdma_v3_0_ring_get_wptr(struct amdgpu_ring *ring)
struct amdgpu_device *adev = ring->adev;
u32 wptr;
if (ring->use_doorbell) {
if (ring->use_doorbell || ring->use_pollmem) {
/* XXX check if swapping is necessary on BE */
wptr = ring->adev->wb.wb[ring->wptr_offs] >> 2;
} else {
@ -380,10 +380,13 @@ static void sdma_v3_0_ring_set_wptr(struct amdgpu_ring *ring)
if (ring->use_doorbell) {
u32 *wb = (u32 *)&adev->wb.wb[ring->wptr_offs];
/* XXX check if swapping is necessary on BE */
WRITE_ONCE(*wb, (lower_32_bits(ring->wptr) << 2));
WDOORBELL32(ring->doorbell_index, lower_32_bits(ring->wptr) << 2);
} else if (ring->use_pollmem) {
u32 *wb = (u32 *)&adev->wb.wb[ring->wptr_offs];
WRITE_ONCE(*wb, (lower_32_bits(ring->wptr) << 2));
} else {
int me = (ring == &ring->adev->sdma.instance[0].ring) ? 0 : 1;
@ -718,10 +721,14 @@ static int sdma_v3_0_gfx_resume(struct amdgpu_device *adev)
WREG32(mmSDMA0_GFX_RB_WPTR_POLL_ADDR_HI + sdma_offsets[i],
upper_32_bits(wptr_gpu_addr));
wptr_poll_cntl = RREG32(mmSDMA0_GFX_RB_WPTR_POLL_CNTL + sdma_offsets[i]);
if (amdgpu_sriov_vf(adev))
wptr_poll_cntl = REG_SET_FIELD(wptr_poll_cntl, SDMA0_GFX_RB_WPTR_POLL_CNTL, F32_POLL_ENABLE, 1);
if (ring->use_pollmem)
wptr_poll_cntl = REG_SET_FIELD(wptr_poll_cntl,
SDMA0_GFX_RB_WPTR_POLL_CNTL,
ENABLE, 1);
else
wptr_poll_cntl = REG_SET_FIELD(wptr_poll_cntl, SDMA0_GFX_RB_WPTR_POLL_CNTL, F32_POLL_ENABLE, 0);
wptr_poll_cntl = REG_SET_FIELD(wptr_poll_cntl,
SDMA0_GFX_RB_WPTR_POLL_CNTL,
ENABLE, 0);
WREG32(mmSDMA0_GFX_RB_WPTR_POLL_CNTL + sdma_offsets[i], wptr_poll_cntl);
/* enable DMA RB */
@ -1203,9 +1210,13 @@ static int sdma_v3_0_sw_init(void *handle)
for (i = 0; i < adev->sdma.num_instances; i++) {
ring = &adev->sdma.instance[i].ring;
ring->ring_obj = NULL;
ring->use_doorbell = true;
ring->doorbell_index = (i == 0) ?
AMDGPU_DOORBELL_sDMA_ENGINE0 : AMDGPU_DOORBELL_sDMA_ENGINE1;
if (!amdgpu_sriov_vf(adev)) {
ring->use_doorbell = true;
ring->doorbell_index = (i == 0) ?
AMDGPU_DOORBELL_sDMA_ENGINE0 : AMDGPU_DOORBELL_sDMA_ENGINE1;
} else {
ring->use_pollmem = true;
}
sprintf(ring->name, "sdma%d", i);
r = amdgpu_ring_init(adev, ring, 1024,